Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Patent
1996-09-12
1999-02-02
Pham, Chi H.
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
370231, 370232, 370235, G01R 3108, G06F 1100, G08C 1500
Patent
active
058674802
ABSTRACT:
In a network node having a host system coupled to a network by an adapter, VC-specific congestion is detected and reported to the host system. The host memory includes rx slots or buffers, each corresponding to one of one or more supported slot types. Per-VC slots consumed counters are maintained to count slot consumption for each active VC. Free buffer FIFOs are maintained for each of the one or more slot types, which have a predetermined congestion threshold associated therewith. Entries in each free buffer FIFO correspond to an rx slot posted by the host system. When a new rx slot or buffer in host memory is to be allocated to an incoming cell received on a given VC, the slots consumed counter is compared to the predetermined congestion threshold. If they are equal, the VC is at threshold level and the incoming cell is discarded and a report is sent to the host system. If the slots consumed counter is below threshold, a new rx slot is allocated for the reception of the data and the slots consumed counter is incremented. If the VC is credit-based flow control enabled and the slots consumed counter is below threshold, a credit is returned. If the VC is credit-based flow control enabled and the slots consumed counter is greater than or equal to the threshold, the credit return is deferred until the counter falls below threshold.
REFERENCES:
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Cheung Wing
Mizuguchi Shinichi
Roman Peter J.
Tanaka Koichi
Thomas Robert E.
Cabletron Systems Inc.
Nguyen Steven
Pham Chi H.
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